interface Some{

 void dosome ();

}

abstract class AbstractSome implements Some {

 public abstract void doSome();

 public void doService() {

  System.out.println("做一些服务");

 }

}

public class FinallyDemo {

 public static void main (String [] args) {

  AbstractSome s = new AbstractSome();

  s.doService();

 }

}
